How to Prune Iris clarkei?
Remove spent flower stems after flowering, and any dying foliage in autumn

Iris clarkei · Iris clarkei
Thrives in a sunny position, in moist but well-drained, ideally neutral to slightly acid soil. Will tolerate some dappled shade, though they flower best in full sun. Divide every three to five years to maintain vigour
Remove spent flower stems after flowering, and any dying foliage in autumn